Installation for the thermal treatment of dispersible raw material, and method for operating such an installation

Abstract

An installation for thermal treatment of free-floating raw material, in particular cement raw meal and/or mineral products, may include a riser line through which hot gases can flow. The riser line has at least one fuel inlet for introducing fuel into the riser line. The riser line has at least one raw meal inlet for introducing raw meal into the riser line, which raw meal inlet is arranged upstream of the fuel inlet in a flow direction of gas inside the riser line. Further, a method for thermal treatment of free-floating raw material may involve introducing fuel via a fuel inlet into a riser line for guiding hot gases and introducing raw meal into the riser line. The raw meal is introduced into the riser line upstream of the fuel inlet in the flow direction.

What is claimed is: 
     
         1 . A method for thermal treatment of free-floating raw material including at least one of cement raw meal or mineral products, the method comprising:
 introducing, through a fuel inlet, fuel into a riser line for guiding hot gases;   introducing, through a raw meal inlet, raw meal into the riser line, wherein the raw meal is introduced into the riser line upstream of the fuel inlet in a flow direction of gas; and   introducing, through an inert gas inlet, inert gas into the riser line;   wherein the riser line includes at least two treatment regions that are arranged in succession in the flow direction, wherein each of the at least two treatment regions has a different diameter, wherein the raw meal is introduced into an upstream treatment region of the at least two treatment regions in the flow direction;   wherein each of the two treatment regions includes a section of the riser line including at least one inlet for introducing raw meal, fuel, and/or inert gas;   wherein each of the two treatment regions includes a middle region having a constant diameter, an upstream region arranged upstream of the middle region having an increasing diameter, and a downstream region arranged downstream of the middle region having a decreasing diameter.   
     
     
         2 . The method of  claim 1  comprising:
 ascertaining a temperature with a temperature measuring unit inside the riser line; and 
 regulating an amount of at least one of raw meal, inert gas, or fuel in the riser line based on the temperature that is ascertained. 
 
     
     
         3 . The method of  claim 1  wherein the fuel inlet is an upstream fuel inlet, wherein fuel is introduced into the riser line via the upstream fuel inlet and a downstream fuel inlet, with the upstream and downstream fuel inlets being arranged in succession in the flow direction, wherein more fuel is introduced at the upstream fuel inlet than at the downstream fuel inlet. 
     
     
         4 . The method of  claim 1  wherein an amount of raw meal that is introduced into the upstream treatment region corresponds to 20% to 60% of a total amount of raw meal introduced into the riser line. 
     
     
         5 . The method of  claim 1  wherein the upstream region has an opening angle of 12° to 30°. 
     
     
         6 . The method of  claim 1  wherein the riser line has at least one cross-sectional constriction located between the two treatment regions, wherein a diameter of the cross-sectional constriction is smaller than diameters of the two treatment regions. 
     
     
         7 . The method of  claim 1  wherein the inert gas is CO2. 
     
     
         8 . The method of  claim 1  wherein the inert gas is water vapor. 
     
     
         9 . A method for thermal treatment of free-floating raw material including at least one of cement raw meal or mineral products, the method comprising:
 introducing, through a fuel inlet, fuel into a riser line for guiding hot gases;   introducing, through a raw meal inlet, raw meal into the riser line, wherein the raw meal is introduced into the riser line upstream of the fuel inlet in a flow direction of gas; and   introducing, through an inert gas inlet, inert gas into the riser line;   wherein the riser line includes at least two treatment regions that are arranged in succession in the flow direction, wherein each of the at least two treatment regions has a different diameter, wherein the raw meal is introduced into an upstream treatment region of the at least two treatment regions in the flow direction;   wherein the riser line has at least one cross-sectional constriction located between the two treatment regions, wherein a diameter of the cross-sectional constriction is smaller than diameters of the two treatment regions.   
     
     
         10 . The method of  claim 9 , further comprising:
 ascertaining a temperature with a temperature measuring unit inside the riser line; and   regulating an amount of at least one of raw meal, inert gas, or fuel in the riser line based on the temperature that is ascertained.   
     
     
         11 . The method of  claim 9  wherein the fuel inlet is an upstream fuel inlet, wherein fuel is introduced into the riser line via the upstream fuel inlet and a downstream fuel inlet, with the upstream and downstream fuel inlets being arranged in succession in the flow direction, wherein more fuel is introduced at the upstream fuel inlet than at the downstream fuel inlet. 
     
     
         12 . The method of  claim 9  wherein the inert gas is CO2. 
     
     
         13 . The method of  claim 9  wherein the inert gas is water vapor.